Because the success or failure of e-learning often depends on a subjective evaluation, it is difficult for one success to be applied to other attempts. In this paper, we propose a method of objectively evaluating e-learning’s educational effects with respect to logical thinking ability. We show the effectiveness of our method in evaluating the education effects of an e-learning site “e-Classroom” (http://www.e-kyoshitsu.org/). The objective evaluation indicated the following effects. (1) Though there were some effects in the whole class, only a few attributes improved significantly. (2) Some persons improved considerably.